问题
i wanna upgrade my vuejs project to typescript based on class components, but i read in vue issue's https://github.com/vuejs/rfcs/pull/17#issuecomment-494242121 :
Update: the Class API proposal is being dropped.
so what will happen to existing class component-based projects? and more important, based on this article: https://alligator.io/vuejs/using-typescript-with-vue/ which says
Since we are not using the class-style syntax, you use the as keyword to declare data as a data type.
is this way of using typescript safe in vue3.0?
回答1:
Currently there is no official class-based API. RFC was about adding one but was dropped for the reason discussed there.
Existing projects are using vue-class-component library which builds on top of official object-based component API. This should continue to work in 3.0 (because object-based component API stays the same) but suffer from the same drawbacks mentioned in the RFC. Here is a comment from maintainer declaring support for Vue 3.
Second linked article is using TypeScript without vue-class-component - no classes, just regular object-based component API + TypeScript type annotations. So yes, this will work in 3.0
However if you are starting with TypeScript in Vue now, I would strongly recommend to take a look at the new composition API which will be added in 3.0. It's an official API (not a library) and has many benefits compared to any existing solution. You can even use it now thanks to composition-api
来源：https://stackoverflow.com/questions/59644684/what-will-happen-for-vuejs-projects-based-on-class-components-in-vuejs-v3-0